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Togekiss has base 50 Attack so in a generic case, no Extremespeed is practically useless since the most your going to do with it is finish of a Pokemon on like 5-10% health
However it does have a rare use in a mixed attacking set in Competitive which would look something like this;
Togekiss @ Life Orb
Ability: Hustle
Brave Nature
EVs: 252 Atk/ 252 SpA/ 4 Spe
-Work Up
-Air Slash
-Extremespeed
-Roost/Aura Sphere/ Drain Punch
Hustle increases Togekiss's physical capabilities by 50% to it becomes a viable mixed attacker with work up, though at the cost of accuracy.